藍芽耳機是聲學產品,聲音品質與清晰度非常重要。目前市場藍芽耳機均具備雙麥克風降噪功能,可分辨人聲去除環境噪音,但是耳機造型本身與細部造型會與環境氣流摩擦,產生「紊流」與「渦流」引發氣流噪音。本研究分類出方塊型、水滴型、圓錐型及溫度計型等四種藍芽耳機基礎造型,運用電腦模擬紊流數據,可以發現藍芽耳機造型與配戴角度,對紊流產生噪音有直接關係,研究結果以「方塊型」最佳,「圓錐型」其次,與傳統流線造型就比較好的觀念不同。由減噪造型特徵分析發現,網孔特徵效能最佳,而弧線特徵與凹槽特徵為最不合適的特徵造型。本研究結論可以使設計師能瞭解可操作的設計範圍,利用縮小去除或組合造型特徵,來達到造型減噪及提升降噪性能的目的。
Bluetooth headset is an acoustic product of which sound quality and clarity are critical. Therefore, the "dual-mic noise reduction function" is the essential feature of the most bluetooth headsets on the present market, which is employed to redecrease the environmental noise. However, the air friction between the headset appearance and the airflow results in the "turbulent flow" & "whirlpool flow" to produce airflow noise. In this research, four basic shapes have been classfied by a survey for the ear hook bluetooth headset apperance–"Box style", "Water-Drop style", "Cone style' and "Thermometer style'. To explore the effect of the airflow noise happened on the bluetooth headset, a software of flow simulation, CFD, has beeen used to simulate the turbulent flow. The result shows that the "Box styles" is the best one to reduce the noise and "Cone shape" is secondary. It is different to the common experience that the streamline shape causes less turbulent flow. The result of this research is also demostrated the “Mesh type” is the optimum solution of the noise-reduction feature which is the design feature to reduce the airflow noise for the bluetooth headset. Both of "Arc type" and "Pit type" are the worst. This research result is useful for the designers to develop the bluetooth headset appearace with high performance of airflow noise reducing.
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